Abstract

The technique of replication developped in France at OCA will be presented. Variations of apparent shrinkage due to spatial distribution of deffects on the surface of substrate will be studied . Ageing of replicas and effect of thermal cycles will be adressed as well. Positive results obtained in the replication of al m diameter parabolic concave master onto a substrate through an intermediate convex replica will be shown. Potential applications may ease the production of large convex mirrors on lightweight substrates using possibly exotic materials.

© 1994 Optical Society of America